The Line of Succession 3: Interregnum. The Line of Succession, #3

Chaos rules an empty throne. The Queen remains steadfastly in a coma. James is adjusting to his life as prince regent, helped by new eye-candy Samuel, while Andrew faces up to the reality of working for the opposition-James' twin sister Alexandra. Andrew and James now find themselves on opposite sides of the war of succession. With Alexandra's bombshell article due to shock the monarchy to its core, she must seek out political allies to take the throne while keeping her restless husband Faisal in check.
But the establishment is fighting back, and they'll use even the most diabolical means to ensure James will produce an heir. The powerful forces behind Operation Rex face a greater threat-Lizzie's plans to expose the monarchy's deadliest secrets to the world. Her pact with the IRA may finally avenge her parents' murder. and truly enthrone a reign of chaos during this interregnum.